engleski

Comparative Interior Helicopter Noise Analysis in Static and In-Flight Conditions

In multi crew cockpit, the exchange of unaltered and straight-forward information is one of the crucial issues in safety of air operations. Therefore, the quality of speech communication between the crew inside the cockpit is extremely critical parameter. Due to generally high levels of interior noise, speech intelligibility is usually strongly impaired unless conducted through the interconnected headsets. The goal of this investigation was to evaluate the quality of straight voice communication inside the cockpit of two light helicopters, Bell 206 and R-44. Several static and in-flight measurements and post-process analysis of interior noise were made in order to collect necessary data for Speech Interference Level (SIL) and Speech Intelligibility Index (SII) calculations. The results, some of which are presented in this paper, have shown that levels of speech intelligibility are generally beyond the acceptable thresholds, which generally justifies the use of headsets, preferably of ANR type, during entire flight operations.

helicopter interior noise; SIL; SII; ANR

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